Power plants – Pressure fluid source and motor – Having a signal – indicator or inspection means
Patent
1984-01-18
1984-12-25
Look, Edward K.
Power plants
Pressure fluid source and motor
Having a signal, indicator or inspection means
60329, 60389, 60390, 60442, 417217, 417 63, F15B 2102
Patent
active
044895518
ABSTRACT:
A failure detection system for a hydraulic pump (1) having a displacement volume varying device (1a) and connected to at least one hydraulic actuator (4) to constitute a hydraulic circuit for driving the hydraulic actuator. The system includes means (7a, 7b) for sensing the discharge pressure of the pump, means (6) for detecting the value of shifting of the displacement volume varying device, means (5, 24) for closing the hydraulic circuit to block the flow of a hydraulic fluid through the circuit, starting means (9) for giving a command to start checking on the pump to see if it is normally functioning, and a control unit (2, 23, 28, 29) for performing checking on the pump to see if it is normally functioning. The control unit includes means (S-5, S-5') responsive to the command given by the starting means for giving a command to activate the closing means, data collecting means (S-11) for causing the displacement volume varying device to shift based on information (P.sub.a, P.sub.b and Y) supplied by the pressure sensing means and shifting detecting means until the discharge pressure of the pump becomes at least substantially equal to a predetermined reference pressure (P.sub.r) to collect data on the value of the shifting of the displacement volume varying device when the discharge pressure becomes substantially equal to the reference pressure, and failure judging means (S-12) for comparing the value collected by the data collecting means with a predetermined reference value of shifting (Y.sub.ra and Y.sub.rb) to produce a failure signal when the collected value is greater than the reference value. The system further includes an indication device (10) responsive to the failure signal produced by the failure judging means for indicating that the hydraulic pump is not normally functioning.
REFERENCES:
patent: 4151718 (1979-05-01), Gravely
patent: 4321016 (1982-03-01), Sakamoto et al.
patent: 4369625 (1983-01-01), Izumi et al.
patent: 4399653 (1983-08-01), Pylat
patent: 4412500 (1983-11-01), Krautkremer
Izumi Eiki
Watanabe Hiroshi
Hitachi Construction Machinery Co. Ltd.
Look Edward K.
LandOfFree
Failure detection system for hydraulic pump does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Failure detection system for hydraulic pump, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Failure detection system for hydraulic pump will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1146737